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Finding the Fourth Proportional to 687.54, 948.74 and 454.64

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Solution

The fourth proportional to 687.54, 948.74 and 454.64 is: 627.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.54 : 948.74 = 454.64 : x
  2. Step 2: Convert to fraction form
    687.54/948.74 = 454.64/x
  3. Step 3: Cross multiply
    687.54x = 948.74 × 454.64
  4. Step 4: Simplify right side
    687.54x = 431,335.15
  5. Step 5: Solve for x
    x = 431,335.15/687.54
  6. Step 6: Final answer
    x = 627.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.